This is a note to let you know that I've just added the patch titled
serial: 8250_fintek: Fix garbled text for console
to my tty git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
in the tty-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From 6c33ff728812aa18792afffaf2c9873b898e7512 Mon Sep 17 00:00:00 2001
From: "Ji-Ze Hong (Peter Hong)" <hpeter@xxxxxxxxx>
Date: Wed, 15 Dec 2021 15:58:35 +0800
Subject: serial: 8250_fintek: Fix garbled text for console
Commit fab8a02b73eb ("serial: 8250_fintek: Enable high speed mode on Fintek F81866")
introduced support to use high baudrate with Fintek SuperIO UARTs. It'll
change clocksources when the UART probed.
But when user add kernel parameter "console=ttyS0,115200 console=tty0" to make
the UART as console output, the console will output garbled text after the
following kernel message.
[ 3.681188] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
The issue is occurs in following step:
probe_setup_port() -> fintek_8250_goto_highspeed()
It change clocksource from 115200 to 921600 with wrong time, it should change
clocksource in set_termios() not in probed. The following 3 patches are
implemented change clocksource in fintek_8250_set_termios().
Commit 58178914ae5b ("serial: 8250_fintek: UART dynamic clocksource on Fintek F81216H")
Commit 195638b6d44f ("serial: 8250_fintek: UART dynamic clocksource on Fintek F81866")
Commit 423d9118c624 ("serial: 8250_fintek: Add F81966 Support")
Due to the high baud rate had implemented above 3 patches and the patch
Commit fab8a02b73eb ("serial: 8250_fintek: Enable high speed mode on Fintek F81866")
is bugged, So this patch will remove it.
Fixes: fab8a02b73eb ("serial: 8250_fintek: Enable high speed mode on Fintek F81866")
Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@xxxxxxxxx>
Link: https://lore.kernel.org/r/20211215075835.2072-1-hpeter+linux_kernel@xxxxxxxxx
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_fintek.c | 20 --------------------
1 file changed, 20 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_fintek.c b/drivers/tty/serial/8250/8250_fintek.c
index 31c9e83ea3cb..251f0018ae8c 100644
--- a/drivers/tty/serial/8250/8250_fintek.c
+++ b/drivers/tty/serial/8250/8250_fintek.c
@@ -290,25 +290,6 @@ static void fintek_8250_set_max_fifo(struct fintek_8250 *pdata)
}
}
-static void fintek_8250_goto_highspeed(struct uart_8250_port *uart,
- struct fintek_8250 *pdata)
-{
- sio_write_reg(pdata, LDN, pdata->index);
-
- switch (pdata->pid) {
- case CHIP_ID_F81966:
- case CHIP_ID_F81866: /* set uart clock for high speed serial mode */
- sio_write_mask_reg(pdata, F81866_UART_CLK,
- F81866_UART_CLK_MASK,
- F81866_UART_CLK_14_769MHZ);
-
- uart->port.uartclk = 921600 * 16;
- break;
- default: /* leave clock speed untouched */
- break;
- }
-}
-
static void fintek_8250_set_termios(struct uart_port *port,
struct ktermios *termios,
struct ktermios *old)
@@ -430,7 +411,6 @@ static int probe_setup_port(struct fintek_8250 *pdata,
fintek_8250_set_irq_mode(pdata, level_mode);
fintek_8250_set_max_fifo(pdata);
- fintek_8250_goto_highspeed(uart, pdata);
fintek_8250_exit_key(addr[i]);
--
2.34.1
